CVE-2026-115419 Amazon Strands Agents SDK - Broken Access Control

Amazon Strands Agents SDK for Python < 1.43.0 and TypeScript < 1.5.0 contain an information disclosure vulnerability caused by improper isolation of conversation state in the A2A server component, letting authenticated remote users read other tenants' conversation history and alter model behavior via HTTP requests with different context_id.

CVSS base score 8.1 /10
High
CISA KEV
Not listed
Public exploit
None known
Authentication
Required
View the NVD record ↗

Details

Type
Broken Access Control
Impact
Information Disclosure, Data Tampering
CVSS vector
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:N
Published
22 October 2026
Updated
23 October 2026
Weakness
CWE-488

Vendor fix

Upgrade to strands-agents 1.43.0 (Python) or @strands-agents/sdk 1.5.0 (TypeScript).

Patching closes this CVE. It does not tell you which of your systems run the affected version, or what else is exposed alongside them.

References

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